<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>框架头</title>
    </head>
    <style>
        /*
         body,*  任何一个元素 都没有内间距
         也没有外间距

         background-image:url(../../images/p.jpeg)   背景图片
         */
        body,*{
            margin: 0px;
            padding: 0px;
        }
    </style>
    <body>
        <div style="width:100%;height:90px;background-image:url(../../images/p.jpeg);">

        </div>
    </body>
</html>